On this day in 1839 we first saw the word we use so often to describe our most middling feelings. That’s right, it’s the birthday of OK. Plus: it's also the anniversary of the time an astronaut smuggled a corned beef sandwich aboard a space mission.
Languages change over time; Merriam-Webster said it added over 500 new words to the dictionary last month. But you can also see those new additions over time through the Time Traveler feature on Merriam-Webster's website. Plus: a piece on Mental Floss explains how some of the most beloved Halloween candies got their names.